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To determine which Linux distribution the Docker installation is configured to download from, you can check the Docker APT repository configuration on your system.
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Inspect the Docker APT repository file
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If the repository is found in a file (e.g., /etc/apt/sources.list.d/docker.list), you can inspect it directly:
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# Option 1: inspect the docker apt repository
grep -r "download.docker.com" /etc/apt/sources.list /etc/apt/sources.list.d/

# Option 2: check the repository file
cat /etc/apt/sources.list.d/docker.list
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If you see multiple entries for download.docker.com in your APT sources, you can determine which one is being used by checking the pinned priority or by inspecting the package metadata.
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Look for the distribution name
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In the output, look for the distribution name (e.g., focal, jammy, bullseye). It will look something like this:
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deb [arch=amd64] https://download.docker.com/linux/ubuntu jammy stable
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Verify the current distribution
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To confirm the distribution your system is running, use:
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lsb_release -cs
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This will return the codename of your distribution (e.g., jammy for Ubuntu 22.04).
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Compare the results
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Ensure that the distribution in the Docker repository matches your system’s distribution. If they don’t match, you may need to update the repository configuration.

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